Electrical Technical

7/31/2019 Electrical Technical

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Sabarmati River Front Development Corporation Limited Page 148

Signature of Bidder

TECHNICAL SPECIFICATION FOR ELECTRICAL WORK

(MATERIAL SPECIFICATION)


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MATERIAL SPECIFICATION

SUMMARY PAGE

I. Electrical Works Page No

______________________________________________________________________________

A. Material Specification

Section - 1 E-6 LT Switchgear 150

Section - 2 E- 9, 10 LT Cabling and Termination 175

Section - 3 E-14 Earthing 176

Section - 4 E-17 External Lighting 181

B Special Condition for Testing 184

C Applicable Standards - IS codes 185

D List of Approved make 189


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ELECTRICAL MATERIAL SPECIFICATION

E - 6 LT SWITCHGEAR & POWER PANEL

1.1 Scope:The scope covers supply, installation, testing and commissioning of electrical panels,incorporating circuit breakers, fuse units, busbars, interconnections, earthing etc.,meeting the requirements shown in equipment schedule and the drawings.

1.2 Standards:AS PER SCHEDULE OF INDIAN STANDARD; ATTACHED WITH THE DOCUMENT.The PCCs & MCCs shall comply with the latest edition of relevant Indian standards andIndian Electricity rules and regulations. The following Indian Standards shall be complied

with:IS : 4237 : General requirements for switch gear and control gear for voltage

not exceeding 1000 V.

IS : 375 : Switchgear bus-bars, main connection and auxiliary wiring,marking and arrangement.

IS : 2147 : Degree of protection provided by enclosures for low voltageswitch gear and control gear.

IS : 8197 : Terminal marking for electrical measuring instrument and theiraccessories.

IS : 2557 : Danger notice plates.

IS : 2516 : Specification for AC circuit breaker.

IS : 1818 : Specification for AC isolator and earthing switch.

IS : 3072 : Code of practice for installation and maintenance of switchgear.

IS : 8623 : Specification for factory built as symbolize of switch gear andcontrol gear for voltage up to and including 1000v. A.C.& 1200 v.D.C.

IS : 8828 : Miniature Circuit Breaker.

IS : 4064 : Fuse switch and switch fuse unit.

IS : 9224 : HRC fuse unit.

IS : 2705 : Current transformer.IS : 3155 : Voltage transformer.

IS : 3231 : Electrical relay for protection.

IS : 1248 : indicating instrument.

IS : 722 : Integrating instrument.

IS : 6875 : Control switches & push buttons.

IS : 2959 : Auxiliary contactor.

IS : 1822 : AC motor starters of voltage not exceeding 1000V.


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1.3 TYPE OF LT SWITCH GEAR:

1.3.1 All the PCCs / PDBs / MCCs shall be metal clad or - environment friendly, recyclable,halogen & silicon free, highly impact resistant, Anti Acid, Anti corrosive & fire retardantpolycarbonate thermoplastic, - (for material of panel i.e. metal or thermo plastic,BOQ should be referred) totally enclosed, rigid, floor / wall mounted, air - insulation,cubical type suitable for operation on three phase / single phase, 415 / 230 volts, 50 Hz.neutral effectively / Non effectively grounded at transformer and short circuit level notless than 30 MVA at 415 volts.

1.3.2 The PCCs / MCCs shall be designed to withstand heaviest condition at site, withminimum expected ambient temperature of 55 degree Celsius, 90 percent humidity anddusty weather.

1.3.3 Should confirm to Indian Electricity Act and rules. (as amended up to date) & approval ofFIA. of India.

1.4 STRUCTURE:

1.4.1 The PCCs, MCCs & PDBs shall be metal clad enclosed and be fabricated out of highquality CRCA sheet, suitable for outdoor installation having dead front operated andfloor mounting type. (Applicable for Metallic Panels Only)

1.4.2 All CRCA sheet steel used in the construction of PCCs / MCCs / PDBs shall be 2 mm

thick and shall be folded and braced as necessary to provided a rigid support for allcomponents. Joints of any kind in sheet shall be seam welded, all welding slaggrounded off and welding pits wiped smooth with plumber metal. (Applicable forMetallic Panels Only)

1.4.2a All Thermoplastic Panel Enclosures made out of environment friendly, recyclablepolycarbonate thermoplastic, halogen & silicon free, highly impact resistant, Anti Acid,Anti corrosive, Colour Gray RAL 7032 ( or as specified later), fire retardant, selfextinguishing glow wire tested at 960 deg. cent in acc with DIN VDE 0304 Part 3, withtransparent / opaque lids having quick fastening mechanism. The panel should beModular Panel Box System type with Degree of Protection IP 65, in accordance with

IEC 60 529, type tested in accordance with IEC 60 439 - 1. (Applicable forThermoplastic Panels Only)

1.4.3 The PCCs / MCCs / PDBs shall be totally enclosed, completely dust and vermin proofand degree of protection being not less than IP-43 for Indoor panels & IP -54 for outdoorpanels . Gaskets between all adjacent units and beneath all covers shall be provided torender the joints dust proof. All doors and covers shall be fully gasket with foam rubberand / or rubber strips and shall be lockable.

1.4.4 All panels and covers shall be properly fitted and screwed with the frame, and holes inthe panel correctly positioned. Fixing screw shall enter into holes taped into an adequate

thickness of metal or provided with bolts and nuts. Self threading screws shall not beused in the construction of PCCs / MCCs / PDBs.


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1.4.5 A base channel of 75 mm x 75 mm x 5 mm thick shall be provided at the bottom.

1.4.6 PCCs / MCCs /PDBs shall arrange in multi-tier formation. The PCCs / MCCs / PDBs

shall be of adequate size with a provision of 20 percent spare space to accommodatepossible future additional switch gear. The size of the PCCs / MCCs / PDBs shall bedesigned in such a way that the internal space is sufficient for hot air movement, and theelectrical component dose not attains temperature more than 40 degree Celsius. Ifnecessary openings shall provided for natural ventilation, but the said openings shall bescreened with fine weld mesh.

1.4.7 Knockout holes of appropriate size and number shall be provided in the PCCs / MCCs/ PDBs in conformity with number, and size of incoming and outgoing conduits / cables.

1.4.8 Alternatively the PCCs / MCCs / PDBs shall provided with removable sheet plates at topand bottom to drill holes for cable / conduit entry at site.

1.4.9 The PCCs / MCCs / PDBs shall be designed to facilitate easy inspection, maintenanceand repair.

1.4.10 The PCCs / MCCs / PDBs shall be sufficiently rugged in design and shall support theequipment without distortion under normal and short circuit condition, they shall besuitable braced for short circuit duty.

1.5 PROTECTION CLASS:

All the indoor PCCs / MCCs / PDBs shall have protection class as per IS.

1.6 PAINTING:

All sheet steel work shall undergo a process of decreasing pickling in acid, cold rinsing,phosphating, pessivating and then sprayed with a high corrosion resistant primer. Theprimer shall be backed in an oven. The finishing treatment shall be by application. Threecoats of synthetic enamel paint of approved colour shall be applied by spray and stovesin dust free atmosphere or the panel shall be powder coated.

1.7 CIRCUIT COMPARTMENT:

1.7.1 Each circuit breaker and switch fuse units shall be housed in separate compartmentsand shall be enclosed an all sides. Sheet steel hinged lockable door shall be duly interlocked with the breaker / switch fuse units in ON and OFF position. Safety interlocksshall be from being drawn out when the breaker is in ON position.

1.7.2 The door shall not form as integral part of the drawout position of the circuit breaker. Allinstruments and indicating lamp shall be mounted on the compartment door. Sheet steelbarriers shall be provided between the tires in a vertical section.

1.8 INSTRUMENT COMPARTMENTSeparate and adequate compartment shall provided for accommodating instruments,indicating lamp, control contactors, relays and control fuses etc. These componentsshall be accessible for testing and maintenance without any danger of accidentalcontact with live parts of the circuit breaker, switch fuse units, busbars andconnections.


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1.9 BUSBARS

1.9.1 The busbar shall be air insulated and made high quality, high conductivity, high strength

copper and as per relevant IS code. The busbar shall of three phases and neutralsystem with separate neutral and earth bar. the busbar and interconnection betweenbusbar and various components shall be of high conductivity, hard drawn, electrolyticcopper. the busbar shall be of rectangular cross section designed to withstand full loadcurrent for phase busbar and full rated current for neutral busbar and shall be extensibletype on either side. The busbar shall be rated for the frame size of the main incomingbreaker but in any case not less than 200 amp capacity. The busbar shall have uniformcross section through out the length.

1.9.2 The busbar and interconnection shall be insulated with heat shrinkable PVC sleeves andbe colour coded in red, Yellow, Blue and Black to identify the three phases and neutralof the system. The busbar shall be supported on unbreakable, non hygroscopic DMCinsulated supports at sufficientevely close interval to prevent busbar sag and shall

effectively withstand electromagnetic stresses in the event of short circuit capacity of 50KA RMS symmetrical for one second and a peak short circuit withstand of 105 KAminimum.

1.9.3 The busbar shall be housed in a separate compartment. The busbar shall be isolatedwith 3 mm thick bakelite sheet to avoid any accidental contact. The busbar shall bearranged such that minimum clearance between the busbar are maintained as perbelow.

Between phases : 27 mm min.Between phases and neutral : 25 mm min.Between phases and earth : 25 mm min.Between neutral and earth : 23 mm min.

1.9.4 All busbar connection shall be done by drilling holes in busbars and connecting bychromium plated brass bolt and nuts. Additional cross section of busbar shall beprovided in all PCCs / MCCs / PDBs to cover-up the holes drilled in the busbars. Springand flat washers shall be used for tightening the bolts.

1.9.5 All connection between busbar and circuit breaker / switches and between circuitbreaker/ switches and cable terminals shall be through solid copper strips of proper sizeto carry full rated current. These strips shall be insulated with insulating strips.

1.10 ELECTRICAL POWER & CONTROL WIRING CONNECTION

a) Terminal for both incoming and outgoing cable shall be suitable for 1100 volts grade,aluminium/copper conductor PVC insulated and sheathed, armoured cable and shall besuitable for connections of solder less sockets for the cable size as indicated on theappended drawing for the PCCs, MCCs, PDBs.

b) Both control and power wiring shall be brought out in cable alley for ease of externalconnections, operation and maintenance.

c) Both control and power terminals shall properly be shrouded.

d) 10% spare terminal shall be provided on each terminal block. Sufficient terminals shallbe provided on each terminal block so that not more than one outgoing wire connectedper terminal.

e) Terminal strip for power and control shall preferably be separated from each other bysuitable barriers of enclosures.


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f) Wiring inside the module for power, control protection and instrument etc. shall be donewith use of 660/1100 confirming to IS 694 and IS 8130. Power wiring inside the startermodule shall be rated for full current rating of contactor, but not less than 4 sq mm cross

section area. For current transformer circuits, 2.5 sq mm copper conductor wire shall beused. Other control wiring shall be done with 2.5 sq mm copper conductor wires. Wiresfor connections to the door shall be flexible. All conductors shall be crimped with solderless sockets at the ends before connections are made to the terminals.

i) Control power for the motor starter module shall be taken from the respective moduleswitchgear outgoing from R phase and Neutral. Control wiring shall have control fuse(HRC type).

j) Particular care shall be taken to ensure that the layout of wiring neat and orderly.Identification ferrules shall be filled to all the wire termination for ease of identificationand to facilitate and testing.

k) "CUPAL" washers shall be used for all copper and aluminum connections.

l) Final wiring diagram of the PCC, MCC, PDB power and control circuit with ferrulesnumber shall be submitted along with the PCC/MCC/PDB as one of the documents.

1.11 TERMINALS

The outgoing terminals and neural link shall be brought out to a cable alley suitablylocated and accessible from the panel front. The current transformer for instrumentmetering shall mount on the disconnecting type terminal blocks. No direct connection ofincoming and outgoing cables to internal components connection of the distributionboard is permitted, only one conductor may be connected in one terminal.

1.12 WIREWAYS

A horizontal PVC wire way with screwed covers shall provided at the top to takeinterconnecting control wiring between different vertical sections.

1.13 CABLE COMPARTMENT

Cable compartment of adequate size shall be provided in the PCCs, MCCs, PDBS foreasy termination of all incoming and outgoing cables entering from bottom or top.Adequate support shall be provided in the cable compartment shall be brought out toterminal blocks in the cable compartment.

1.14 EARTHING

a) Copper earth busbar of 25 mm x 3 mm shall be provided in the PCCs, MCCs, PDBs forthe entire length of panel. The frame work of the PCCs, MCCs, PDBs shall beconnected to this earth busbar. Provisions shall be made for connection from earthbusbar to the main earthing bar coming from the earth pit on both sides of the PCCs,MCCs, PDBs.

b) The earth continuity conductor of each incoming and outgoing feeder shall be connectedto this earth bar. The armour shall be properly connected with earthing clamp and theclamp shall be ultimately bounded with the earth bar.

1.15 LABELS

Engraved PVC labels shall be provided on all incoming and outgoing feeders. Single line

circuit diagram showing the arrangements of circuit inside the distribution board shall bepasted on inside of the panel door and covered with transparent laminated plastic sheet.


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1.16 NAME PLATE

a) A name plate with panel designation in bold letter shall be fixed at top of the central in

panel. A separate name plate giving feeder giving feeder details shall be provided foreach feeder module door.

b) Inside the feeder compartment, the electrical component, equipments, accessories likeswitchgear, contactor, lamp, relays etc. shall suitably be identified by providing stickers.

c) Engraved name plates shall preferably be of 3 ply, (red-white-red or black-white-black)lamicold sheet. However black engraved perplex sheet name plates shall also beapplicable. Engraving shall be done with square groove cutters.

d) Name plate shall be fastened by counter sunk screws and not by adhesives.

1.17 DANGER NOTICE PLATE

a) The danger plate shall be affixed in a permanent manner on operating side of the panel.b) The danger notice plate shall indicate danger notice both in Hindi and English and with a

sign of skull and bones.

c) The danger notice plate in general shall meet to requirements of local inspectingauthorities.

d) Overall dimension of the danger notice plate shall be 200 mm wide and 150 mm high.The danger notice plate shall be made from minimum 1.6 mm thick mild steel sheet andafter due pre-treatment to the plate, the same shall be painted white with vitreousenamel paint on both front and rear surface of the plate.

e) The letter, the figure, the conventional skull and bones shall etc. shall be positioned onthe plate as per recommendations of IS : 2551-1982.

f) The said letter, the figure and the sign of skull and bones be painted in single red colouras per IS : 5-1978.

g) The danger plate shall have rounded corners. Locations of fixing holes for the plate shallbe decided to suit design of the panel.

h) The danger notice plate, if possible, be of ISI certification mark.

1.18 INTERNAL COMPONENTS

a) The PCC / MCC / PDB shall be equipped complete with all type of required number ofair circuit breakers, switch fuse unit, contactor, relays, fuses, meters, instruments,indicating lamps, push buttons, equipment, fittings, busbar, cable boxes, cable glandsetc. and all the necessary internal connections /wiring as required and as indicated onrelevant drawings. Components necessary for proper complete functioning of the PCC / MCC / PDB but not indicated on the drawings shall be supplied and installed on thePCC / MCC / PDB.

b) All part of the PCC / MCC/ PDB carrying current including the components, connections, joints and instruments shall be capable of carrying their specified rated currentcontinuously, without temperature rise exceeding the acceptable values of the relevantspecifications at any part of the PCC / MCC / PDB.

c) All units of the same rating and specifications shall be fully interchangeable.


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1.19 INSPECTIONS

Each equipment should inspect and witness by client & consultant.

a) The PCC / MCC / PDB shall be inspected and checked as per inspection manual of thePCC / MCC / PDB manufacturer.

b) Various electrical components and accessories of the PCC / MCC / PDB shall bechecked as per drawing for the respective PCC / MCC / PDB.

c) The PCC / MCC / PDB shall be checked for rigid mounting, earthing connections, properrating and size of components, internal wiring, etc.

d) All mechanical fasteners and electrical connections shall be checked and tightenedbefore installation.

e) Type test certificates for all ACB for similar rating shall be submitted.

f) Test:

a) Prior to dispatch of the PCC / MCC / PDB following tests shall be carried out.

b) Mechanical endurance test shall carry out by closing and opening of all the ACBs,MCB's switches etc.

c) Over voltage and Insulation resistance test shall be carried out between phases andbetween phases to earth bus, keeping the isolating switch in ON position. Similartest shall be carried out keeping the isolating switch in closed position.

d) All the interlocks, controls and tripping mechanism of the switch gears shall be

tested for their proper functioning.

1.20 COMPONENTS:

A) GENERAL

a) The type, size, and rating of the components shall be as indicated on the relevantdrawings.

b) While selection OD the capacity of the components resulting from the prevailingconditions like room temperature shall be allowed for the Thermal and magnetic triprating shall be compensated for the ambient temperature.

c) The rating indicated on the drawings are rating anticipated at prevailing site condition.

B) FUSE SWITCH UNIT: NOT REQUIRED

C) MINIATURE CIRCUIT BREAKER

Miniature circuit breakers shall be quick make and break and break type conform withBritish standard BS: 3871 (Part-I) 1965 and IS: 8825 (1996). The housing of MCBs shallbe heat resistant and having a high impact strength. The fault current of MCBs shall notbe less than 10000 amps, at 230 volts. The MCBs shall be flush mounted and shall beprovided with trip free manual operating mechanism with mechanical "ON" and "OFF"indications.


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The electrical contact of the circuit breaker shall be of high conducting non deterioratingsilver alloy contacts.

The MCCB shall be provided with thermal / magnetic type bi-metal over load releaseand electro-magnetic short circuit protection device. All the releases shall operate oncommon trip busbar so that in case of operation of any one of the releases in any of thethree phases, it will cut off all the three phases and thereby single phasing of the systemis avoided.

The MCCB whenever called for in the appendix drawings shall provide an earth faultrelay.

The MCCB shall provide two sets of extra auxiliary contacts with connections foradditional controls at future date.

The electrical parameters of the MCCB shall be as per the descriptions given in the

appended drawings.G) CONTACTORS:

The contactor shall meet with the requirements of IS : 2959 and BS : 775.

The contactors shall have minimum making and breaking capacity in accordance withutilization category AC 3 and shall be suitable for minimum class II intermittent duty.

If the contactor forms part of a distribution board then a separate enclosure is notrequired, but the installation of the contactor shall be such that it is not possible to makean accidental contact with live parts.

H) LOAD MANAGER:

The load manager should be 192 x 144 mm size having facility to read voltage currentharmonics power parameters. It should contain real time clock. The meter should befield programmable and to generate high / low profile for all power parameters with date& time, also able to store previous period integrated data. The meter should have RS485 port for networking purpose. All the programming should be pass word protected.

I) CURRENT TRANSFORMER

Where ammeter is called for, CT's shall provide for current measuring. Each phase shallbe provided with separate CT of class I accuracy and suitable VA burden for operationof associated metering and controls. Current transformer shall be in accordance with IS :

2705 - 1964 as amended up to date.

J) PUSH BUTTON:

The push button unit shall comprise of the contact element, a fixing holder, and pushbutton actuator. The push button shall be momentary contact type. The contacts shall beof silver alloy and rated at 10 Amps. continuous current rating. The actuator shall be ofstranded type and colour as per its usage for ON, OFF and Trip.

K) INDICATING LAMP:

Indicating Lamp shall be transformer operated low voltage rated and shall suppliedcomplete with translucent covers to diffuse the lamp light.

Colour shade for the indicating lamps shall be as below:


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ON indicating lamp : RedOFF indicating lamp : GreenTRIP indicating lamp : Amber

PHASE indicating lamp : Red, Yellow, Blue.L) CAPACITOR BANKS WITH APFCR/RTPF PANEL:

1.0 Scope

1.1 The design, manufacture and performance of the power factor improvement capacitor / capacitor banks shall comply with all currently applicable statutes, regulations and safetycodes in the locality where the equipment will be installed. The equipment shall alsoconform to the latest applicable Indian / British / IEC standards. In particular theequipment shall conform to the latest revisions of the following:

IS: 2834 : Shunt capacitors for power system.

IS: 2208 : HRC cartridge fuse and links up to 660 V.

When the above standards are in conflict with the stipulation of this specification, thisspecification supersedes them.

CONSTRUCTION:

CAPACITOR BANK

Capacitors should be marked as per IS: 13340, IS: 13341 and should conform to IS:12672. It should be suitable for temperature category of 50 deg. Cen. Capacitor banksshall comprise of identical delta connected three phase units. The individual capacitor

unit shall be manufactured out of double layer mixed dielectric design comprising ofbasally oriented polypropylene film and capacitor tissue paper. Each individual elementof the capacitor tissue unit shall be provided with silver fuse wire. The capacitor unit shallconsist of many such elements in series / parallel combinations for getting the desiredKVAR output. The capacitor shall be vacuum impregnated with liquid dielectric havinghigh thermal stability. The dielectric losses of the capacitor shall be restricted to 1 wattper KVAR. The phase terminal connections of the capacitor unit shall be brought out atthe top through metal insulators which should be soldered to the fabricated top cover.The capacitor shall be provided with suitably rated discharge resistors. The capacitorshall be designed to withstand the electrodynamics and thermal stresses caused bytransient over current during switching. The capacitors should be provided with overpressure safety interrupter mechanism, which will automatically disconnect faultycapacitor unit from the network silently without bursting, bulging or exploding the

capacitor.

BUSBAR CHAMBER

Capacitor bank shall be provided with a bus-bar chamber. The chamber shall be dustand vermin proof in construction, fabricated from 2 mm thick sheet steel. Continuousneoprene rubber gaskets shall be provided on all mating surfaces. TP Bus-bars shall beof copper supported on epoxy insulators of adequate rating and strips.

The bus-bar sizes and clearances shall be suitable for connection of cables throughcrimping type cable lugs. Bus-bar chamber shall be extended suitably on one side toenable termination of cable. There shall be a provision of cable end box at the end ofbus-bar chamber undrilled removable gland plate and access covers to be provided for

cable entry as required.


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EARTHING:

The enclosure of individual capacitor unit shall be provided with 2 nos. 10 mm dia

earth terminals, each complete with two plain and one spring washer, nuts etc. Theseterminals shall be effectively bonded to the common sheet steel frame work. Eachbank will have two external earth terminals in the bus-bar chambers complete withhardware.

PAINTING:

All sheet steel shall be thoroughly cleaned, decreased and phosphate painted with twocoats of suitable primer and finished with two coats of paint. The type and shade of paintbe as specified in Data Sheet.

DRAWINGS:

The following drawings shall be submitted along with the bid:

a. General arrangement drawing showing overall dimensions, weight, internalarrangement and mounting details.

b. Terminal chamber, showing bus-bar arrangement with all dimensions.

TEST & TEST CERTIFICATES:

Vendor shall carry out all routine tests as specified in IS: 2834 and shall furnish the testcertificates.

The vendor shall also carry out the thermal stability test on the units in the presence ofpurchasers representatives.

The capacitor units shall be tested from electric supply authorities like G. E. Board / A.E. Co. and the test certificates in duplicate shall be furnished to client and also the copyshall be submitted to the electric supply authority while getting the power supplyreleased from them.

CAPACITOR PANEL:

Capacitor control panel should be automatic type.

The panel for capacitor shall be fabricated from 2.0 mm thick sheet steel and shall befinished as per clause no. 5.0. Earthing terminals shall be provided as per clauseno.4.0. The panel shall be provided with suitably rated TPN copper bus-bar supportedon epoxy insulators and with heat shrinkable type sleeves. Each capacitor unit shall beconnected to main busbar through contactors of suitable rating with safety margin.Protective breaker for each capacitor bank of suitable rating should be provided.

Connections shall be made with PVC insulated flexible copper cables having crimpedcopper lugs. Continuous earthing conductor / strip of G.I shall run through and allcapacitor units shall be earthed. Sufficient ventilation shall be provided in the capacitorcompartment to limit the temperature rise. Cooling fans shall be provided with ON-OFFswitches as per requirements.

The main bus-bar shall be terminated on suitably rated MCCB. Vertical compartmentwith detachable gland plate shall be kept for incoming cable connections from bottom ortop as specified.


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Capacitors units shall be mounted on angle frame of strong construction.

The panel shall be mounted on M.S. channel section at bottom for easy installation.

The panel shall be provided with lifting hooks / Eye bolts for handling.

Automatic power factor correction sensing relays (RTPFC) shall be provided with allrelated circuits and contactors for controlling the power factor by energizing thecontactor and related capacitor bank "ON" or "OFF" as per load conditions.

The controller shall be set for time lag of 45 seconds so that on sensing the low or highpower factor it energies or de energizes the contactor after 45 seconds.

The Dust and vermin proof switching compartment shall be isolated from capacitormounting compartment.

The panel shall be provided with:a. MCB /MCCB of adequate capacity as per rating.b. 100 x 100 mm. flush type 0-500 V voltmeter with selector switch.c. 100 x 100 mm. flush type Ammeter with suitably rated C.T. and selector switch.d. Supply "ON' indication lamp (R-Y-B).e. Power Factor meter 0.5 lag to 0.5 lead.f. KVAR meter of suitable rating.g. Each outgoing feeder should be provided with adequate size breaker, contactor,

relay, ON/OFF push button with indicating lamp, auto/manual by pass switch withindicating lamp.

h. By - pass switch for each capacitor unit.i. Automatic Power Factor correction relay unit with ON - OFF mode selector switch.

The capacitor panel shall be installed away from wall with sufficient distance for bettercooling and ease of maintenance.

The following drawings shall be submitted before procurement for approval from theclient.

1. General arrangement and Fabrication details.2. Power wiring diagram of capacitor panel.3. Control wiring diagram of capacitor panel.4. C.T. connection.

1.2 Approval, Testing & Co-ordination:

1.2.1 The following drawings shall be submitted before procurement for approval from theclient.

1. General arrangement and Fabrication details.2. Power wiring diagram of the panel.3. Control wiring diagram of panel.4. C.T. ratios with connection.5. Material list with make, catalogue nos and

1.2.2 Testing and setting the relay set point and co-ordination between relay on LT/HTfuses, breaker, setting shall be done by contractor. The down stream of the settingshould be provided.


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1.2.4 The relay should be tested by reputed agencies and test report of the relay should besubmitted by the contractor.

M) Technical Specifications for Single Phase & Three phase Electronic Energy Meterof Class 1.0 Accuracy1.0 SCOPE

This specification covers the design, engineering, manufacture, testing and calibration atmanufacturers works before dispatch, packing, supply and delivery of Class 1.0accuracy, electronic energy meter, suitable for connection to LT

A) Single phase 2 wire 240V systemB) Three phase 3-phase, 4- wire 415V system

The static whole current electronic meter shall offer current range of 5-30 A, 10-60A (firstdigit indicates the Basic Current & second digit indicates the Maximum Current of the

respective meters) for tariff purposes, as per requirement given in this specification.2.0 STANDARDS APPLICABLE

Unless specified elsewhere in this specification, the performance & testing of the metersshall conform to the following Indian/International standards, to be read with up to-dateand latest amendments/revisions thereof.

S. No. Standard No. Title1 IS 13779 read with its

latest amendmentsSpecification of AC Static Watt hour meters class1.0 & 2.0

2 CBIP Report No.88

(revised July 1996) readwith latest amendments

Specification for AC Static Electrical Energy Meters

3.0 CLIMATIC CONDITION

The meters to be supplied against this specification shall be suitable for satisfactorycontinuous operation under the following tropical conditions. Meters shall be capable ofmaintaining required accuracy under hot, tropical and dusty climate.

i) Maximum Ambient Air Temperature in shade : 50oCii) Minimum Ambient Air Temperature : -10oC.iii) Relative Humidity 100% : 95% (non-

condensing)Iv) Minimum Relative Humidity : 100%

4.0 SUPPLY SYSTEM

System 1 Phase 2 Wire 3 Phase 4 WireRated voltage (Vref) 240 V Phase to Neutral 433 V Phase to PhaseRated Basic Current (lb) Basic current 5/10/10 Amps

(lb), Maximum current30/60/100 Amps (l max)

Basic current 5/10/10 Amps(lb), Maximum current30/60/100 Amps (l max)

Rated Frequency 50 Hz 50 Hz5.0 POWER SUPPLY VARIATION

The meter should be suitable for working with following supply system variations.


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11.9 The meter cover shall be sealable to the meter base with at least 2 nos. seals. Alsoterminal cover shall have provision for sealing with at least one seal.

11.10 The terminal block shall be made of high grade non-hygroscopic, fire retardant, lowtracking, fire resistant, reinforced poly-carbonate or equivalent high grade engineeringplastic with terminal holes of minimum dia 8.5 mm and shall be suitable toaccommodate the insulation of the conductors, meeting the requirement of IS 13779 /CBIP technical report-88.

11.11 The manner of fixing the conductors to the terminal block shall ensure adequate anddurable contact such that there is no risk of loosening or undue heating. Meter shallhave 2 screws in each terminal for effective clamping of cables. Screw connectionstransmitting contact force and screw fixing which may be loosened and tightenedseveral times during the life of the meter shall be such that the risk of corrosionresulting from contact with any other metal part is minimized. Electrical connections

shall be so designed that contact pressure is not transmitted through insulatingmaterial. The clearance and creepage distance shall conform to relevant clause of IS13779/CBIP technical report No.88.

11.12 The meter shall be compact in design. The entire construction shall be capable ofwithstanding stresses likely to occur in actual service and rough handling duringtransportation. The meter shall be convenient to transport and immune to shock andvibration during transportation and handling.

11.13 The meter shall have 3 fixing holes, one at top and two at bottom. The top hole shallbe such that the holding screw is not accessible to the consumer after fixing themeters. The lower fixing screws shall be provided under the sealable terminal cover.

12.0 ANTI-TAMPER FEATURES

The meter registration shall be immune to reversal in current direction. The meter shallhave anti-tamper features

13.0 DISPLAY13.1 The measured value(s) shall be displayed on a Liquid Crystal display (LCD) register.

The height of the digit shall be minimum 8.5 mm. The KWh energy registration shalltake place with 6 complete digits. The display shall have backlit capability for easyreading.

13.2 The data should be stored in non-volatile memory (NVM). The non-volatile memoryshould retain data for a period of not less than 10 years under un-powered condition.Battery back-up memory will not be considered as NVM.

13.3 The register shall be able to record and display starting from zero, for a minimum of1500 hours, the energy corresponding to rated maximum current at reference voltageand unity power factor. The register should not roll over in between this duration.

13.4In addition to providing serial number of the meter on the display plate, the meter serialnumber shall also be programmed into meter memory for identification throughcommunication port for CMRI/meter reading print out.


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14.0 DISPLAY SEQUENCE

The meter shall display the required parameters in two different modes as follows:

A) Auto Display Mode:

The following parameters hereinafter referred to as Billing Parameters (B.P) shall bedisplayed in an auto-cycle mode, in the following sequence:-

LCD TestReal TimeDateCumulative Active energy (forwarded) reading (kWh)Instantaneous Load (KW)Billing period counts

Each parameter shall be on meter display for 10 seconds and the time between twoauto-cycles shall be 120 seconds.

B) Push Button Mode:-

In addition to the auto display mode parameters, the following parameters shall bedisplayed on pressing the push button

C) LCD TestReal TimeDateInstantaneous voltage, currentThe meter shall also be capable of offering a high resolution display which shall enableconducting of dial testing by the user in the shortest possible time and as a minimum,the meter shall be capable of offering a resolution of 4 digits after decimal (and 2 digitsbefore decimal) for the high resolution KWh display.

15.0 COMMUNICATION PORT

The meter should have a galvanic ally isolated optical communication port for datacommunication. Adequate sealing provision shall be provided.

16.0 MARKING OF THE METER

The marking on the meter shall be in accordance with relevant clauses of IS 13779.

The basic marking on the meter nameplate shall be as follows:

a) Manufacturers name & trade markb) Type Designationc) No. of phases & wiresd) Serial numbere) Year of manufacturef) Reference Voltageg) Rated Currenth) Principal unit(s) of measurementi) Meter Constant ( imp/ kwh) j) Class index of meterk) Property of ______l) Purchase Order No. & Date


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17.0 CONNECTION DIAGRAM & TERMINAL MARKINGSThe connection diagram of the meter shall be clearly shown on terminal cover.

18.0 OUTPUT DEVICEThe meter shall have a test output accessible from the front and capable of beingmonitored with suitable testing equipment while in operation at site. The test outputdevice shall be provided in the form of LED output.

1.21 L T FEEDER SECTION PILLAR

1.21.1 SCOPE:

(i) This specification covers the scope of design, fabrication, assembling, inspection atvender's works and delivery in properly packed condition to project site of cubicalpattern MV Switchgear.

(ii) The switchgear would comprise Main L.T. power distribution panel, Section pillar,sub-section pillar, power distribution board (PDB).

1.21.2 CODES AND STANDARDS :

(A) The equipment shall be designed to conform to the requirements of followingIndian Standards:

IS : 8623 and IEC-439 : Factory built assemblies of switchgear andcontrol gear.

IS : 4237 : General re uirements for switchgear andcontrol gear for voltage not exceeding 1000

volts.IS : 2147 : Degree of protection provided by enclosuresfor low voltage switchgear and control gear.

IS : 375 : Marking and arrangement of bus bars.

(B) Individual equipment housed in the Medium Voltage Switchgear shall conform tothe following IS specifications.

1. IS : 13947(part-3) & IEC:947-3 :

: Air break switches and fuses combinationunits for voltage not exceeding 1000 Volts(specific requirements for the direct switchingof individual motors) i.e. suitable for AC 23duty.

2. IS : 1248 : Direct acting electrical indicating instruments.3. IS : 694 (1990) and IS :

8130 (1994): PVC insulated cables and aluminium

conductors.4. IS : 13703 (PART 2 ) : Low voltage fuses.5. IS : 13947 (PART 2 ) : Air circuit breakers.6. IS : 2705 : Current transformers7. IS:13947(PART-4/SEC-1)

& IEC-60947-4-1: Contactors.

8. IS:13947(PART-4/SEC-1)& IEC-60947-4-1

: Thermal overload relay

9. Indian Electricity Rules : As amended up to date10. Approval From T.A.C./F.I.A. OR C.P.R.I. Tested.


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8.3 DESIGN & CONSTRUCTION REQUIREMENTS:

(a) The switch board shall be for outdoor application, metal enclosed or

Polycarbonate Thermoplastic , dust & vermin roof, free standing, floormounting, compartmentalized, modular type & extensible on both sides.

(b) The switch board shall be fabricated from CRCA sheet steel having followingminimum thickness (Applicable for metallic panels only) :

o Frames, load bearing members & large doors : 2.5 mm(12 swg)o Partitions & small doors : 2.03 mm(14 swg)o Front, back & side covers : 2.03 mm(14 swg)o Section pillar : outer side(Front, back & side covers) 12 SWG and inner side

14 SWG

(c) The switch board shall be totally insulated Section Feeder Pillar Panel made out of

Modular Panel Box System, Degree of Protection IP 65, in accordance with IEC60 529, type tested in accordance with IEC 60 439 - 1. Enclosures made out ofenvironment friendly, recyclable polycarbonate thermoplastic, halogen & siliconfree, highly impact resistant, Anti Acid, Anti corrosive, Colour Gray RAL 7032 (oras specified later), fire retardant, self extinguishing glow wire tested at 960 deg.cent in acc with DIN VDE 0304 Part 3, with transparent / opaque lids having quickfastening mechanism. (Applicable for Thermoplastic panels only)

(d) The board shall be divided in to distinct vertical sections, each comprising of:

o A completely enclosed bus bar chamber running horizontally throughout thelength of the switchboard.

o Individual feeder modules.o Vertical busbar chamber at the side of feeder modules or back of the feedermodule.o Cable alley shall be with 250 mm width for double front execution.

(e) The switchboard shall be provided with degree of protection of not less than IP42 as per IS 2147 for indoor application and all section pillar /sub-section pillarshall be of not less than IP-55 as per IS outdoor application.

(f) Maximum height of the board including the height of the Base Channel shall be2450 mm. Also, the minimum & maximum mounting height of the switches, relays& instruments etc. shall be 200 mm & 2000 mm respectively, above the bottom ofthe Base Channel.

(g) Suitable sized thick neoprene gaskets shall be provided all round the perimeter ofdoors, covers etc for making the construction dust & vermin proof.

(h) Power/control terminals in the cable alleys for each module & also the busbarchamber shall be covered with hinged & bolted type Hylam shrouds respectivelyto prevent accidental contact when the door/cover is withdrawn. In each feedermodule, the phase barrier of Hylam sheet shall be provided between the adjacentphases.

(i) Suitable lifting hooks shall be provided on each shipping section of the board. Eachmodule shall be considered as separate shipping section.

(j) In case of double front type design the vertical busbar chamber shall be

common for the front sided feeders as well as for the rear sided feeders ineach panel of the switchboard.


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(k) Gland plate of 5 mm thickness shall be provided at the top or bottom of the board,and gland plate shall be of non -magnetic type. (Where ever required)

(l) All the feeder modules & the cable alleys are provided with hinged type doors andcam lock with key lock chromium plated, whereas all the busbar chambers areprovided with bolted type .

(m) Main earth bus of aluminium flat shall be suitably placed running throughout thelength of the switchboard.

(n) All the hardwares used in the construction of the switchboard shall bechromium /zinc plated passivated type with spring washers to avoid loosening ofthe fixed parts.

8.4 METAL TREATMENT AND PAINT FINISH (Applicable for Metallic Panels only) :

(a) PRE TREATMENT CHEMICAL PROCESS:All sheet steel work used in the construction of the switchboards shall be pre-treated with 7-tank chemical process as specified in the specific requirement sheetbefore applying the two coats of zinc chromate primer followed by syntheticenamel/epoxy paint as follows :

7- TANK PROCESS :-

1. DEGREASING:-

In this process the M.S. Sheets shall be effectively cleaning by dipping in hotalkaline degreasing solution for the period of about 10-20 minutes.

2. WATER RINSING:-

After degreasing process the M.S. sheets shall be rinsed in to the water for theperiod of about 1-2 minutes to remove the loosened oil, grease and adheringalkali from the surface.

3. DERUSTING:-

In this process the M.S. sheets shall be pickled in dilute sulphuric acid to removeoxide scales and rust formation for the period of about 30 minutes.

4. WATER RINSING:-

After the de-rusting process the M.S. sheets shall be rinsed in to the water for theperiod of about 1-2 minutes to remove the traces of acidic solution from thesurface.

5. PHOSPHATING:-

In this process the M.S. sheets shall be dipped in to the zinc phosphate solutionfor the period of about 30 minutes to facilitate durable coating of the paint onthe metal surfaces.


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6. WATER RINSING:-

After the phosphating process the M.S. sheets shall be rinsed in to the water for

the period of about 1-2 minutes to remove the traces of phosphate solutionfrom the surface.

7. PASSIVATION:-

In this process the M.S. sheets shall be dipped in to the de-oxalite solution forthe period of about 1 minute to retain and augment the effects of phosphatingon the surface.

After completion of 3-tank/7-tank process a fine grained, smooth and compactcoating of iron/zinc phosphate shall be produced, which is an excellent base forpaint and provide under film protection against corrosion. The coating shall meetthe Indian Standard Specification IS:3618-1966 class C.

(b) DRYING:

After the above pre treatment chemical process, the M.S. sheets shall bedried either by means of hot air circulation oven (stoving) or by means ofblast of compressed air (air drying).

(c) PRIMER COATING:

Primer coating with two coats of highly corrosion resistant zinc chromate primershall be done before applying the final paint finish.

(d) PAINT FINISH:

The final finishing of synthetic enamel/epoxy paint of RAL-7032 shall be mattfinish powder coated.

8.5 MATERIAL/COMPONENT SPECIFICATIONS :

(A) BUSBAR:

(a) The busbar shall be air insulated with heat shrinkable coloured sleeves andmade of high conductivity high strength Aluminium complying to the requirements ofIS : 5082.

(b) The busbar shall be suitably braced with non-hygroscopic epoxy resin cast/SMCsupports at regular distance to provide a through fault withstand capacity of 50 KARMS symmetrical for one second and a peak short circuit withstand of 150 KAminimum. Ridges shall be provided on the busbar supports to prevent trackingbetween adjacent busbars.

(c) The main horizontal busbars shall be positioned at top portion running throughoutthe length of the switch board. The cross section of the busbar shall be uniformthroughout the length of busbar. The busbars shall be insulated with colouredPVC heat shrinkable sleeves i.e. red coloured for R-phase, yellow coloured for Y-phase, blue coloured for B-phase and black coloured for Neutral. Also the sequenceof R, Y & B phase busbars shall be from top to bottom/left to right/front to backrespectively and Neutral busbar shall be fixed near to R or B phase busbar.


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(d) The vertical busbars shall be provided in separate vertical busbar alley adjacentto individual feeder modules. Suitable barrier shall be provided in front of verticalbusbar against accidental contact after the module has been withdrawn.

(e) Pre-drilled holes shall be provided on the vertical risers so that modules can bechanged at site, for vacant feeders also.

(f) High tensile bolts and spring washers shall be provided at all busbar joints. Also,all busbar joints shall be protected by using hylum/plastic shrouds.

(g) The minimum clearance in air between phase to phase busbars as well asbetween phase to earth shall be 25 & 20 mm respectively or as per fault levelrequirement.

(h) Main busbars shall be adequately sized, so that, while carrying rated currentcontinuously the maximum temperature of busbars, even at joints, does not exceed

85 degree centigrade.(i) Danger caution plates shall be provided on each busbar chamber cover.

(j) For Aluminium bus bar, current shall be considered 400 Amps per 625 Sqmmcross-sections.

(B) UNIT MODULE:

(a) Each module shall be suitable for mounting drawout type air circuitbreakers/MCCB/MCB power fuses, control fuses, contactors, relays, push buttons,indicating lamps, terminal blocks etc. as may be required.

(b) Each module shall be provided with individual door and the door shall be mountedon the main structure. The doors shall be provided with concealed hinges. Themodule door with chromium plated locks / key operation.

(c) Unit doors shall be interlocked mechanically with breaker/switch/fuse switchto prevent unintentional opening of the door while the units is in energized condition.However, provision should be made to open the door in energized condition i.e.defeat facility, for testing purpose.

(d) Main HRC fuses shall be positioned before the isolator to eliminate any positionhazards during a fault at the isolator terminals. The HRC fuses however, shall notbe accessible when they are in live condition.

(C) CIRCUIT BREAKERS:-

(a) The circuit breaker shall be air break type, FOUR pole, Drawout type andelectrically operated type as specified in the schematic drawing complying to therequirements of IS : 13947(PART 2)

(b) The circuit breaker shall be provided with shunt trip mechanism.

(c) The circuit breaker shall be provided with inbuilt over current, short circuitand earth fault releases or separate protection relays as may be specified in theschematic drawing. All release shall be micro processor based.

(d) The circuit breaker shall be provided with 6 NO + 6 NC auxiliary contacts

rated 10 Amp, 240 Volt AC supply duly wired up to the terminal block for purchaser'suse.


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(e) The circuit breaker shall be provided with red, green, amber and whiteindicating lamps for indicating closed, open, auto trip and trip circuit healthyconditions of the breaker. all release shall be micro processor based.

(f) Automatic safety shutters shall be provided to completely cover the femaleprimary contacts when the breaker is withdrawn from service position.

(g) Compartment door of breaker should not open unless the associated breaker is inopen position. The interlock defeat also to be provided.

(h) Closing action of the breaker shall charge the tripping spring ready for tripping.

(i) Manually operated breaker shall be of the spring charging stored energy type.

(j) Electrically operated breaker shall be provided with following:-

(i) 1 no 240 V, 1-ph, 50 Hz AC universal motor for charging the breaker closingspring along with HRC fuse link with base and carrier or SP MCB of appropriaterating and of approved make. Motors shall be sized such that maximum springcharging time is less than 15 seconds.

(ii) Limit switches with 2 NO + 2 NC contacts for cutting off the power supply tospring charging motor when spring is under fully charged conditions.

(iii) Closing of breaker shall automatically initiate the recharging of closing springready for next closing.

(D) SWITCHES/FUSE SWITCHES : Not Applicable

(E) FUSES :

(i). Fuses shall be of HRC cartridge link type having rupturing capacity of not lessthan 80 KA at 440 Volt.

(ii). Fuses shall preferably be mounted in moulded plastic carriers and shall becomplete with fuse bases.

(iii). Fuses shall be suitably rated to prevent damage of the switchgears incorporatedin the respective circuit of the particular module in case of overloading or anyother fault occuring in the circuit.

(F) CONTACTOR :

(i). All the motor starter feeders shall be provided with electromagnetic type triple

pole contactors suitably rated for uninterrupted AC-3 duty and shall comply withthe requirements of IS : 13947 (PART 4 /SEC. 1)

(ii). Main contacts of the contactors shall be of silver plated copper.

(iii). Each contactor shall be provided with 2 NO + 2 NC auxiliary contacts.

(iv).Operating coils of contactors shall be suitable for operation from the controlsupply of 420V/240V/110V AC.

(G) TIMER WITH POWER RESERVE CAPACITY:

(i). Power reserve capacity of timer shall be minimum up to 150 HRS. And timer with

24 HRS. Programmer.


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(ii). Timer shall be with High switching capacity and with inbuilt over-ride facility.

(iii). Modular construction, Flush\Base\Din rail mounting

(H) THERMAL OVERLOAD RELAYS :

(i). All the motor starter feeders shall be provided with triple pole bimetal thermaloverload relays with inbuilt single phasing protection to furnish protectionagainst overload and single phasing and shall comply to all the requirements ofIS : 13947 (PART 4 /SEC. 1)

(ii). Thermal overload relays shall be provided with adjustable settings. The settingrange shall be properly selected in accordance with the rating of the motor.

(iii). Thermal overload relays shall be provided with at least 1NO + 1 NC auxiliary

contacts.(iv).Thermal overload relays shall be either self reset type or hand reset type. In

case of hand reset type thermal overload relays, the reset push button shallbe mounted flush on the compartment door separate from start/stop pushbutton.

(I) CURRENT TRANSFORMERS:

Current transformers shall have adequate class of accuracy and VA burden tocomply with all the requirements of IS : 2705.The design of currenttransformers shall be of ring tape wound type. Unless otherwise specified, theminimum performance requirements of current transformers are as follows:

Measuring CT :- rated burden 15 VA, accuracy class 1.0Protective CT :- rated burden 15 VA, accuracy class 5P10

All current transformers shall be earthed through a separate earth link on the terminalblock to permit easy measurement of the current transformer insulationresistance. Secondary windings of current transformers shall be rated for 1 Amp asspecified in the schematic diagram of the switchboard.

(J) INDICATING INSTRUMENTS:

(i). Ammeters and Voltmeters shall be of moving iron spring controlled (MISC)industrial type suitable for flush mounting of size 144x144/96x96 sq.mm. of

suitable range as specified in the schematic drawing of the switchboard.

(ii). Ammeters with suppressed scale current rating shall be provided for specificrequirements.

(iii). Energy meter (KWH meter) of direct reading 3-phase 4 wire unbalance type shallbe provided wherever specified in the schematic drawing of the switchboard. Itshould be mounted inside the compartment but can be read through cut out on thecompartment door.

iv) Power factor meter (PF meter), frequency meter (Hz meter), Wattmeter (KWmeter) etc. shall be provided if specified in the schematic drawing of theswitchboard.


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(K) INDICATING LAMPS :

(i). Indicating lamps shall be of LED. The lamps shall have translucent lenses to

diffuse light.(ii). Indicating lamps shall be provided in the respective colours i.e. Red, Yellow, Blue,

Green, Amber, white etc. as required in the schematic drawing of the switchboard.

(L) PUSH BUTTONS :

(i). Push buttons shall be rated for 10 Amp at 240 Volt AC and provided with 1 NO + 1NC auxiliary contacts.

(ii). On/start push button actuator shall be of Green colour, off/stop push buttonactuator shall be of Red colour and O/L relay reset push button actuator shallbe of Black colour.

(M) INTERNAL WIRING:

(i). All power/control wiring of the switchboard shall be made with 1100/660 Voltgrade Black/Gray FRLS-PVC insulated flexible/stranded copper wires.

(ii). The size of control wiring shall be 2.5 sq.mm. except for CT secondary circuitof 2.5 sq.mm. wire.

(iii). Pin type crimping lugs shall be provided for flexible wire terminations.

(iv).Power wiring shall be terminated preferably on stud/clamp type terminal blocks,whereas, control wiring shall be terminated on clip-on type terminal blocks.

(v). All electrical connections are made vibration proof by proper tightening by usingplain washers and spring washers etc.

(N) TERMINAL BLOCK:

(i). Terminal blocks for power circuits shall be of 660 V grade with contacts of ratingnot less than 10 Amps.

They shall be of the stud type of Elmex/Connectwel make with insulated barriersbetween adjacent terminals.

(ii). Terminal blocks for control circuits shall be of clip on type of Elmex/Connectwel

make complete with mounting channel.

(iii). The wire terminations to the blocks shall be screw type suitable for crimp typesocket.

(iv).Suitable provision shall be made to terminate power/control connections in therespective module.

(O) SPACE HEATER:

Space heater with thermostat and switch shall be provided in each cable alley of thecubical switchboard if specified in the specific requirement sheet.


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E 14 EARTHING

1.0 Scope of Work:

The scope of work shall cover supply, laying, installation, connecting, testing andcommissioning of:

1. copper/galvanized/aluminium/chemical or Electrode type Earthing station.

1.2 Earthing G.I./Aluminum/copper strips from earthing station to equi-potential bar.

1.3 Earthing G.I./ Aluminum/ copper strips/ wires from equi-potential bar to lay feeder mainsand circuit to connect power panels, DBs, switchboards etc.

1.4 Bonding of Non-current carrying parts, and metallic parts of the electrical installation.

1.5 Provide inter connection between all earth pits of same type.2.0 STANDARDS

2.1 The following standards and rules shall be applicable:

1) IS: 3043 - 1966 Code of practice for Earthing.

2) Indian Electricity Act and Rules

2.2 All codes and standards mean the latest. Where not specified otherwise the installationshall generally follow the Indian Standard Code of Practice or the British Standard Codesof Practice in absence of Indian standard.

3.0 GENERAL

All the non-current carrying metal parts of the electrical installation and mechanicalequipments shall be earthed properly. The metal conduits, trucking, cables armoured andsheath, electric panels boards, lighting fixtures, ceiling and exhaust fan and all other partsmade of metal shall be bonded together and connected by means of specified earthingsystem.

An earth continuity conductor shall be installed with all the feeders and circuits and shallbe connected from the earth bar of the panel boards, to the conduit system, earth stud ofthe switch box, lighting fixture, earth pin of the socket outlets and to any metallic wallplates used. All the enclosures of motors shall be also connected to the earthing system.

4.0 TYPE OF EARTHING STATION

4.1 PLATE EARTHING STATIONS

4.1.1 The earthing station shall be as shown on the drawing IS:3043.

4.1.2 The earth resistance shall be maintained with suitable soil treatment as shown in thedrawing.

4.1.3 The resistance of each earth station should not exceed the limit specified in IS : 3043.

4.1.4 The earth lead shall be connected to the earth plate through copper/brass bolts in case of

copper earth plate and shall be hot dip galvanized iron for G.I. plate earth plate as shownon the drawing.


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4.1.5 The earthing grid and the earthing conductors shall be of copper strip in case of copperearth plate and hot dip galvanized iron strip in case of G.I. earth plate of size asmentioned on the drawing.

4.1.6 G.I. pipe with funnel with filter of approved quality shall be used for watering the earthingelectrodes \ stations.

4.1.7 The block masonry chamber with Cast Iron hinged cover of 300 x 300 mm shall beprovided for housing the funnel and the pipe for watering the earthing electrodes \ stations.

4.2 PIPE EARTHING STATIONS

4.2.1 The substation earthing shall be with GI Pipe earthing station and equipment earthinggrid shall be with hot dip galvanized iron earthing station.

4.2.2 The Pipe electrode shall 38mm dia GI pipe for earthing4.2.3 The earthing station shall be as shown on the drawing.


4.2.5 The resistance of each earth station should not exceed 4 ohms.

4.2.6 The earth lead shall be connected to the earth plate through copper/brass bolts in case ofcopper earth plate and shall be hot dip galvanized iron for G.I. Pipe earth as shown onthe drawing.

4.2.7 The earthing grid and the earthing conductors shall be of hot dip galvanized iron strip ofsize as mentioned on the drawing.

4.2.8 The block masonry chamber with Cast Iron hinged cover of 300 x 300 mm shall beprovided for housing the funnel and the pipe for watering the earthing electrodes \ stations.

4.2.9 The hardware and other consumable for earthing installation shall be of copper/brass incase of copper earth plate and shall be hot dip galvanized iron material in case of G.I.Pipe , as per details shown in the drawing .

4.3 ELECTRODE / CHEMICAL TYPE EARTHING STATIONS:

4.3.1 The substation earthing and equipment earthing shall be with T-39 OR & T-19 as perearthing scheduled in BOQ & Drawing.

4.3.2 The earthing station shall be as shown on the drawing.


4.3.4 The resistance of each earth station should not exceed the limit specified in IS: 3043.

4.3.5 The earthing grid and the earthing conductors shall be of copper strip of size asmentioned on the drawing.

4.3.6 The block masonry chamber with Cast Iron hinged cover shall be provided for housingthe termination block as shown in the drawing.


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4.3.7 The hardware and other consumable for earthing installation shall be of copper/brass, asper details shown in the drawing.

5.0 INSTALLATION AND CONNECTION:5.1 The plate \ pipe electrode, as far as practicable, shall be buried below permanent

moisture level but in no case not less than 2.5 M below finished ground level.

5.2 The plate \pipe electrode shall be kept clear of the building foundation and in no case, itshall be nearer by less than 2 M from outer face of the respective building wall \ column.

5.3 The plate electrode shall be installed vertically and shall be surrounded with 150 mm.thick layers of Charcoal dust and Salt mixture.

5.4 G.I. pipe for watering shall run from top edge of the plate \ pipe electrode to the mid levelof block masonry chamber.

5.5 Top of the pipe shall be provided with G.I. funnel and screen for watering the earth \ ground through the pipe.

5.6 The funnel with screen over the G.I. pipe for watering to the earth shall be housed in ablock masonry chamber as shown in the drawing.

5.7 The masonry chamber shall be provided with a Cast Iron hinged cover resting over theCast Iron frame which shall be embedded in the block masonry.

5.8 Construction of the earthing station shall in general be as shown in the drawing and shallconform to the requirement on earth electrodes mentioned in the latest edition of IndianStandard IS : 3043, Code of Practice for Earthing Installation.

5.9 The earth conductors ( Strips / Wires copper/ Hot dip G.I.) inside the building shallproperly be clamped / supported on the wall with Galvanized Iron clamps and Mild SteelZinc Passivated screws \ bolts. The conductors outside the building shall be laid at least600 mm. below the finished ground level.

5.10 The earth conductors shall either terminate on earthing socket provided on the equipmentor shall be fastened to the foundation bolt and / or on frames of the equipment. Theearthing connection to equipment body shall be done after removing paint and other oilysubstances from the body and then properly be finished.

5.11 Over lapping of earth conductors during straight through in joints, where required, shallbe of minimum 75mm. long.

5.12 The earth conductors shall be in one length between the earthing grid and the equipmentto be earthed.

6.0 EARTH LEADS AND CONNECTIONS:

6.1 Earth lead shall be bare copper or galvanized steel as specified with sizes shown ondrawings. Copper lead shall have a phosphor content of not over 0.15 %. Galvanizedsteel buried in the ground shall be protected with bitumen and Hessian wrap or polytenefaced Hessian and bitumen coating. At road crossing necessary hume pipes shall be laid.Earth lead run on surface of wall or ceiling shall be fixed on saddles so that strip is atleast 8 mm away from the wall surface.

6.2 The complete earthing system shall be mechanically and electrically bonded to providean independent return path to the earth source.


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7.0 EQUIPMENT EARTHING:

All apparatus and equipment transmitting or utilizing power shall be earthed in the

following manner. Copper/G.I. earth strips/wires shall be used unless other wise indicatedin the Schedule B.

8.0 POWER TRANSMISSION APPARATUS

8.1 Metallic conduit shall not be accepted as an earth continuity conductor. A separateinsulated / bare earth continuity conductor of size 50 % of the phase conductor subject tothe minimum and maximum shall be provided.

Copper Aluminum G.I.

Minimum (sqmm) 2.5 4.0 6Maximum (sqmm) 75 100 200

The earth continuity conductor be drawn inside the conduit shall be insulated.

8.2 Non metallic conduit shall have an insulated earth continuity conductor of the same sizeas for metallic conduit. All metal junction and switch boxes shall have an inside earth studto which the earth conductor shall be connected. The earth conduct or shall be distinctlycoloured (Green or Green/Yellow) for easy identification.

8.3 Armoured cable shall be earthed by two distinct earth connections to the armouring atboth the ends and the size of connection being as for the metallic conduit.

8.4 In the case of unarmoured cable, an earth continuity conductor shall either be run outsidealong with the cable or should form a separate insulated core of the cable.

8.5 Three phase power panel and distribution boards shall have two distinct earthconnections of the size correlated to the incoming cable size. In case of single phaseDB's a single earth connection is adequate.

9.0 UTILIZING EQUIPMENT:

9.1 Three phase motors and other three phase apparatus shall have two distinct earthconnections of the size equal to 50% of the connecting cable subject to the following:

Copper Aluminum G.I.

Minimum (sqmm) 6.5 10 20

Maximum (sqmm) 75 10 200

9.2 For single phase motors and apparatus, the single earth connection shall be provided ofthe above size. For all light fittings and fans a single earth connection with 1.5 sqmmcopper or equivalent size shall be provided.

9.3 All street light poles shall have an earth stud and shall be connected to the cablearmouring using 6.5 sqmm copper or equivalent unless shown otherwise. For streetlighting poles planted in ground, 2.4 M long 10 SWG bare copper wire shall be coiled andburied with every fourth pole in addition to connection to cable armouring.

9.4 An equipment earthing grid shall be established as shown in the drawing. All earthconnections to all panels, DB's and equipment shall be connected to the nearest point of

the earthing grid.


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10.0 TEST:

10.1 The entire earthing installation shall be tested as per requirements of Indian Standard

Specification IS: 3043.10.2 The following earth resistance values shall be measured with an approved earth meggar

and recorded.

1) Each earthing station2) Earthing system as a whole3) Earth continuity conductors

10.3 Earth conductor resistance for each earthed equipment shall be measured which shallnot exceed 1 Ohm in each case. This is responsibility of contractor to get the final valuefor resistance.

10.4 Measurements of earth resistance shall be carried out before earth connections aremade between the earth and the object to be earthed.

10.5 All tests shall be carried out in presence of the consultant..

11.0 METHOD OF MEASUREMENT:

11.1 Provision of earthing station complete with excavation, plate, earth lead up to chamber,earth link in the chamber, electrode, GI watering pipe, Salt, Charcoal, soil treatment toachieve the earth resistance less than 4 ohm, masonry chamber with cast iron cover etc.shall be treated as one unit of measurement.

11.2 The following items of work shall be measured and paid per unit length covering the cost

of the earth wires/strips, clamps, labour etc.

a) Main equipment earthing grid and connection to the earthing stations.b) Connection to the power panels, DB etc.

11.3 The cost of earthing the following items shall become part of the cost of the item itself andno separate payment for earthing shall be made.

a) Light fittings - form part of installation of the light fitting.b) Conduit wiring, cabling - should form part of the wiring or cabling.c) Street lighting - should form part of the street light poles.


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E-17 External Lighting

1.0 Scope:

1.1 The scope of work covers the supply, installation and testing of lighting poles withrequired foundation as per drawing complete in all respect, weather proof light fixtures,wiring to the fixtures, cable laying, earthing as specified and shown on drawings.

2.0 Standards:

As per Applicable standard.

3.0 Light Fixtures:

3.1 The light fixture construction shall be of IP 65 die cast aluminium with a separatecompartment for integral ballast equipment. The reflector shall be anodized polishedaluminium. The glass refractor shall be heat resistant.

3.2 Lamp holder shall be of porcelain and shall comprise of a terminal block of nohygroscopic material. The luminaries shall have integral ballast housed in water tightand dust tight metal cases. Ballast shall be pre-wired to the Lamp socket and terminalblock, requiring only power supply leads to the ballast primary terminals.

3.3 The Lamp & Laminar shall generally follow the specification under section `LIGHTFIXTURES'.

4.0 Lighting Poles: Lighting Poles for street lights /flood lights shall be swaged typeGI pole construction / GRP Poles as specified below

4.1 The lighting poles shall be fabricated from heavy duty cold rolled steel tubes toIS:1239-1958 and hot dip galvanized or painted as specified. The pole shall have a baseplate, a large access panel, and necessary fixture mounting bracket at top. The accesspanel shall provide easy access to a multi-way porcelain connector and fuse board, tobe mounted inside the pole. The access shall be specially fabricated with adequatereinforcement and weather gasket to prevent ingress of moisture and vandal proof.Poles shall have large diameter entries for incoming and outgoing cable and two earthstuds. The pole fabrication shall conform to the drawings and where such drawing is notavailable; the contractor shall make such drawing and have it approved beforefabrication. It will be fixed with the foundation as shown in the drawing.

4.2 The pole shall house a multi-way integral type terminal block and MCB as shown on thedrawings. Pole shall have a concrete coping.

4.3 Detail specifications of GLASS REINFORCED POLYMER (GRP) COMPOSITEPOLE

Design:

The GRP Poles shall be designed to withstand the maximum wind speed as per IS875. The Pole shall withstand top load up to 300 Kgs.

Pole Shaft:The pole shaft shall be in continuously conical shape. It should be in a single piececonstruction.


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7.0 Mode of Measurement:

7.1 Each light fitting with lamp, control gear, earthing etc. shall be considered as one unit for

measurement and payment.7.2 Each lighting pole, concrete coping, base plate earthing etc. shall be considered as one

unit for measurement and payment.

7.3 All cabling work shall be measured on the basis of unit length and the cost shall include,cost of cable, cable termination in junction boxes or pole terminal box etc.


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SPECIAL CONDITION FOR TESTING(CONTRACTOR TO READ THIS CAREFULLY)

1.0 SCOPE :

If required contractor should have to take all necessary testing/ random testing ofequipments and component prior to supply as per the guidelines / rules / samplingmethod etc. of IS at manufacturing works or other standard lab in presence of Clientsrepresentative & consultant as witness testing. Any deviation in parameters which isnot as per IS is not accepted and client reserve the rights to reject the same at anystage of the project.


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APPLICABLE STANDARDS

Sr. No. IS No. Description

1) IS: 2026-1977 : Power transformers fittings.&1981 -1994

2) IS 3639-1966 : Fittings and acc. For P.T.

3) IS10028-Part III1981 : Installation of Transformer.

4) IS: 13118-1991 : Specification for High voltage AC circuitbreakers.

5) IS: 335- 1993 : Insulating oil for Transformers & switchgear.

6) IS: 2705-1992 : CT for measuring and protection.

7) IS: 3156-1992 : Voltage (Potential) Transformers.

8) IS: 3156-1992 : Voltage Transformer.

9) IS: 8623-Part II : Bus -bar arrangement and marking

10) IS: 2099-1986 : Bushing

11) IS: 5621-1980 : Large Hollow Porcelains Insulator

12) IS: 2544-1973 : Insulators greater than 1000V

13) IS: 2629-1985 : Hot Dip GalvanizingIS: 2633-1986

14) IS: 3842-1967 : Relays for AC system

15) IS: 1248-2003 : Meters (measuring).

16) IS: 10118-1982 : Installation of Switch gears.

17) IS: 692-1994 : HV Cable Paper Insulated LeadSheathed Cables for Rated Voltage up toand Including 33 kV Specification.

18) IS: 1255 -1983 : Installation of HV cables and jointing.

19) IS: 3043-198 : Code of practice for earthing.

20) IS: 13947-Part III : HD Air breaker, Switch gears-1993 and fuses for Voltage not

exceeding 1000 Volts.

21) IS: 13703-Part IV : Selection, installation and maintenance -

1993 of fuses up to 650 Volts.


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22) IS: 13947-Part I : General requirements for switch gear and-1993 control gear for voltage not exceeding

1000 Volts.

23) IS: 13947-Part III : Air-b reak isolators for Voltage not-1993 exceeding 1000 Volts.

24) IS:8623- 1993 : Factory built assemblies of switch gearsand control gears for voltage up to andincluding 1000 Volts A.C. and 1200 VoltsD.C.

25) IS: 11353-1985 : Marking and arrangement of switch gearbus bars main connectors and auxiliarywiring.

26) IS: 13947 PART-1 : Cubical Boards.27) IS: 8084-1976 : Insulated Bus bar rating.

28) IS: 2675-1983 : Enclosed distribution fuse boards andcut-outs for Voltage not exceeding 1000Volts.

29) IS: 8828-1995 : Miniature Circuit Breaker.

30) IS: 9926-1981 : Fuse wire used in rewirable type electricfuses up to 650 Volts.

31) IS: 1554-Part I : PVC insulated electric cables-1988 Heavy duty.

32) IS: 3961-Part II & IV : Recommended current rating-1967 for cables.

33) IS: 8130-1984 : Copper conductor in insulated cables andcores.

34) IS: 8130-1984 : Conductor for insulated electric cablesand flexible cords.

35) IS: 3975-1999 : Low Carbon Galvanized Steel Wires,

Formed Wires and Tapes for Armouringof Cables - Specification

36) IS: 5831-1984 : PVC insulation and sheath of electriccables.

37) IS: 8130-1984 : Aluminum conductor for insulated cables.

38) IS: 11955-1987 : Recommended current rating for Cable.

39) IS: 732-1989 : Code of practice for electrical wiringinstallation system Voltage not exceeding650 Volts.


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40) IS: 1646-1997 : Code of practice for fire safety ofBuildings (general) electrical installation.

41) IS: 9537-1981 : Rigid steel conduits for electrical wiring.42) IS: 2667-1988 : Fittings for rigid steel conduits for

electrical wiring.

43) IS: 3480-1966 : Flexible steel conduit for electrical wiring.

44) IS: 3837-1976 : Accessories for rigid steel conduits forelectrical wiring.

45) IS: 694-1990 : PVC insulated cables (wires).

46) IS: 9537-Part III : Installation of Rigid non-metallic

-1983 conduits for electrical wiring.47) IS: 6946-1973 : Flexible (playable) non-metallic conduits

for electrical installation.

48) IS: 1293-2005 : Plugs and sockets up to 250V.

49) IS: 8130-1984 : Conductors for insulated electrical cablesand flexible codes.

50) IS: 9537-1980 : Specification for conduit for electricalinstallation.

51) IS: 3419-1988 : Accessories for non -metallic conduits forelectrical wiring.

52) IS: 3854-1997 : Switches.

53) IS: 6538-1971 : Plugs.

54) IS: 13585-Part I : Shunt Capacitors for power-1998 systems up to 650V.

55) IS: 1370 : Low voltage fuse and links up to 1000volts.

56) IS: 1913-1978 : General and safety requirement forlighting fittings.

57) IS: 1944-1981 : Code of practice for lighting publicthorough fares.

58) IS: 3528-1966 : Waterproof electric lighting fittings.

59) IS: 3553-1966 : Water tight electric lighting fitting.

60) IS: 1239-Part I : Mild Steel tubular and other-2004 wrought steel pipe fitting.

61) IS: 10322-Part V : Luminaries for street light.-1987


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62) IS: 13703-Part III : HRC fuses having rupturing-1993 capacity voltage up to 1000V.

63) IS: 2312-1967 : Exhaust Fan.

64) IS: 374-1979 : Class I Ceiling Fan.

65) IS: 7098 (Part I, II, III) : XLPE armoured Cables up to-1988 1000V.

NOTE: All codes and standards means the latest where not specified otherwise the installationshall generally follow the Indian Standard codes of practice or relevant British StandardCodes of Practice in the absence of corresponding Indian Standards.

PLEASE FOLLOW:

a. Indian Electricity Act of 1910 and rules issued there under revised up to date.

b. Regulations for electrical equipment in building issued by The Bombay RegionalCouncil of insurance Association of India.


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LIST OF APPROVED MAKE / MANUFACTURER

1) Rigid PVC Conduit : ISI & FIA approved & manufactured fromvirgin material. Precision, Nihir, Polycab.

2) Accessories for conduit : Same make as of pipe

3) Flexible Copper Wires : FRLS type: Finolex, Polycab, Primecab.

4) Switches & its accessories : MK India (Logic), MK (Bleez), Legrand(Mosaic), Crabtree (Emerald), Toyama(Accura Plus)

5) Fan Box : Cast Iron type only

6) Switch fuse Units : L&T, Siemens, Schneider60 Amps - AC 23 duty

7) HRC Fuses : Schneider MG, Siemens, L&T.

8) MCCB/MCB/ELMCB/Iso & Acc : Legrand (Lexic),Schneider MG, L&T.

9) Distribution Boards : Legrand (lexic), Schneider MG (Multi 9),L&T.

10) Telephone wires/Cable : Delton, Finolex, Polycab, Primecab

11) PVC tape : Steel grip, Anchor

12) LT Cables : Finolex, Primecab, CCI, Avo cab

13) Branched Cable downstream : Finolex, Primecab, CCI, Avo cabFrom 35 sqmm.

14) Glands : Compression type, Heavy duty and deep

threading with rubber ring and doublewashers. (Sample to be approved) HMI,Comet

15) Cable Lugs : Dowels, 3-D

16) Industrial Plug-socket : Legrand, Indoasian

17) Connectors : Elmex, Connectwel

18) Button holder, Angle : Anchor, CPL

holder, ceiling rose


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19) M.S. Conduit ISI : BEC, Steel Craft, AKG

20) A.C.B : Schneider MG, L&T

21) Telephone tag block : Krone

22) Capacitor : L&T Mehar, EPCOS, Conzerv

23) Relay(Numerical) : Areva, Siemens, ABB, Schneider

24) Relay(Auxiliary) : ABB, AREVA, Schneider

25) APFC Relay : Conzerv, L&T, ElMeasure, HPL

26) Meter(DIGITAL ENERGY METERS) : Secure, L&T, ElMeasure, HPL

27) Light Fixture : Phillips, Keselec, Bajaj, Crompton, Wipro / equi. (Sample to be approved)

28) Ceiling Fans : Crompton, Usha

29) Exhaust Fan : Crompton, Usha, Almonard

30) Call bell : Anchor Ding Dong type.

31) Dry type transformer : Voltamp, Crompton

32) Cable Tray : Indiana, Power Control

33) TV Cable : Finolex, Polycab, RPG, Universal

34) Panel Fabricators (Metallic) : CPRI approved vendors only

34a) Panel Fabricators (Thermoplastic): Hensel, Schneider, Spelsberg.

35) Load ManagerPower meter/MFM : Conzerv, L&T, ElMeasure, HPL

36) Anchor Fasters : Hilti or equivalent

37) On Load Changeover : Havells, L&T, Schneider, HPL

38) Fire Extinguisher : Should be of ISI a rovedSafex, Firex, Safeline

39) Meters (V, A, PF etc) : IMP, AE, RISHABH, ElMeasure, HPL


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40) Timer : Theban (Indoasian), Legrand, Schneider

41) Raceway : MK (Ega), Legrand

42) Data Wire / Cable, I/O : Systemex, Avya

43) High MastHigh Mast Shaft & Accessories : Bajaj, Crompton, BPPLuminaries : Bajaj, Phillips, Crompton, Keselec-

Schreder

44) GRP Poles : Bajaj, Sumip, Wipro, / equi.

45) LT CT : KAPPA/ AE / Pragati

46) DWC Pipes : Rex, Dutron, equi

47) Electrode type Earthing : Ashlok, Universal, Errico, LPI

48) Traffic Signal System : CMS, Nucleonics, Swarco, Bajaj .

49) Control Cables : Finolex, Primecab, Lapp Cables

Special Notes :

The successful tenderer will have to supply the makes from above in consultation with theClient / Architect / Consultant without any extra cost.

The tenderer should have to submit considered makes from the above list along with thetender with covering letter of separate letter enclosure. However, the final decision foraccepting make specified by tenderer would be of client / Architect / Consultants.

As far as possible, the successful tenderer will have to place order directly to the

manufacturer OR its authorized dealer.

The Client/Architect/Consultants have right to check the challans of supplier.

The MCB and MCB DBs must be of same make.

Make of components required to be used by contractor to complete the installation, if notmentioned any where, shall be required to GOT IT APPROVED byClient/Architect/Consultant before installation in writing manner.

Within a week of work order the contractor shall submit the sample of each item /

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Electrical Technical